Try exiv2 -pa --grep lens/i with your image file
Then you should see the custom defined LensType value

> Am 07.02.2022 um 19:06 schrieb Ludger Bolmerg <[email protected]>:
> 
> 
>> 
>> 
>>> On 2/7/22 18:37, Remco Viëtor wrote:
>>> As you are using a third-party lens, the information available to lensfun
>>> might cover several lenses. As your lens is in the database, you can use the
>>> drop-down menu in the lens correction module to manually select the lens, or
>>> create a .exiv2 file in your home directory linking the lens ID to the lens
>>> (look on the web for details on how to do that)
>>> 
>> For some strange reason I don't see the lens in the drop-down menu.
>> So will have to figure out how .exiv2 file option works
> 
> I am still struggling.
> This is my .exiv2 file:
> 
> [tokina]
> 139=Tokina AF 11-20mm f/2.8 AT-X Pro DX
> 
> and here is what I get from exiv2 and exiftool
> 
> % exiv2 -pt DSC_4593.NEF | grep Lens
> Exif.Nikon3.LensType                         Byte        1  D G
> Exif.Nikon3.Lens                             Rational    4 11-20mm F2.8
> Exif.Nikon3.LensFStops                       Undefined   4  6
> Exif.NikonLd3.LensIDNumber                   Byte        1  139
> Exif.NikonLd3.LensFStops                     Byte        1  F6.0
> 
> % exiftool DSC_4593.NEF | grep Lens
> Lens Type                       : G
> Lens                            : 11-20mm f/2.8
> Lens Data Version               : 0204
> Lens ID Number                  : 139
> Lens F Stops                    : 6.00
> Lens ID                         : Unknown (8B 48 1C 30 24 24 85 06)
> Lens Spec                       : 11-20mm f/2.8 G
> 
> Can somebody confirm if the entry in .exiv2 is correct?
> 
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